I'll say this from experience, having seen people around me really change through their practice and pushing themselves to spend their time more meaningfully.
I have seen people become stronger, better speakers, more convincing, more mature, more kind, more attentionate, more compassionate, more altruistic, more involved, more dynamic! I have seen them becoming INSPIRING!
These people are an inspiration for me to spend my time more meaningfully FOR I HAVE SEEN THE RESULT IN OTHERS around me.
So I say there is one thing that can propel people to follow your footsteps and spend their time more meaningfully: BECOME BETTER, SHOW QUALITIES THAT THEY WANT TO HAVE AND THEY'LL FOLLOW YOUR FOOTSTEPS, they'll want to be around and get your recipe!
I have had the privilege to meet very dedicated Dharma practitionners and witness them improve, and I see how this inspire many more in turn to do what they do: SPENDING THEIR TIME MEANINGFULLY.